Best Practices Exist For A Reason

Re:Best Practices Exist For A Reason by btilly on Wednesday May 02, 2012 @05:31PM (#3921312)

Actually JS does allow trailing commas. Read the spec.

It is an IE bug that causes it to break. One of the many ways they do not follow the spec.

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Re:Best Practices Exist For A Reason by damncabbage on Wednesday May 02, 2012 @11:23PM (#3922235)

It's the other way around. It was illegal in ECMAScript 3, which is what IE 8 and below (at the very least) implement:

  ObjectLiteral : 
      { } 
      { PropertyNameAndValueList }

With ECMAScript 5 it is legal:

  ObjectLiteral : 
      { } 
      { PropertyNameAndValueList } 
      { PropertyNameAndValueList , }

So before v5, the other browsers were incorrectly tolerating something that goes against the spec. It's only semi-recently that it's been "allowed" as a valid practice.

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